add concat.go

examples/wavConcat/concat.go

@@ -0,0 +1,87 @@
+package main
+
+import (
+	"fmt"
+	"github.com/rlfosterjr/wav"
+	"os"
+)
+
+func concat(files []string, ofn string) {
+	var wf = wav.File{
+		Channels:        2,
+		SampleRate:      44100,
+		SignificantBits: 16,
+	}
+
+	of, _ := os.Create(ofn)
+	defer of.Close()
+
+	inc := len(files)
+	ww, err := wf.NewWriter(of)
+
+	if err != nil {
+		fmt.Println(err)
+	} else {
+		for i := 0; i < inc; i++ {
+			fmt.Println("File: " + files[i])
+			f, _ := os.Open(files[i])
+			stat, _ := f.Stat()
+			wr, _ := wav.NewReader(f, stat.Size())
+			fmt.Println(wr.String())
+
+			var s uint32
+			samps := wr.GetSampleCount()
+
+			for s = 0; s < samps; s++ {
+				cs, _ := wr.ReadRawSample()
+				ww.WriteSample(cs)
+			}
+			f.Close()
+		}
+		ww.Close()
+	}
+}
+
+//Test Wav Concat (stereo)
+func main() {
+
+	//concat incremnts
+	inc := 3
+
+	increments := make([]string, inc)
+	increments[0] = "../../corpus/0009.wav"
+	increments[1] = "../../corpus/0918.wav"
+	increments[2] = "../../corpus/1827.wav"
+
+	of, _ := os.Create("concat.wav")
+	defer of.Close()
+
+	var wf = wav.File{
+		Channels:        2,
+		SampleRate:      44100,
+		SignificantBits: 16,
+	}
+
+	ww, err := wf.NewWriter(of)
+	if err != nil {
+		fmt.Println(err)
+	} else {
+		for i := 0; i < inc; i++ {
+			fmt.Println("File: " + increments[i])
+			f, _ := os.Open(increments[i])
+			stat, _ := f.Stat()
+			wr, _ := wav.NewReader(f, stat.Size())
+			fmt.Println(wr.String())
+
+			var s uint32
+			samps := wr.GetSampleCount()
+
+			for s = 0; s < samps; s++ {
+				cs, _ := wr.ReadRawSample()
+				ww.WriteSample(cs)
+			}
+			f.Close()
+		}
+		ww.Close()
+	}
+}

writer.go

@@ -26,7 +26,7 @@ type Writer struct {
 
 // NewWriter creates a new WaveWriter and writes the header to it
 func (file File) NewWriter(out output) (wr *Writer, err error) {
-	if file.Channels != 1 {
+	if file.Channels < 0 || file.Channels > 2 {
 		err = fmt.Errorf("sorry, only mono currently")
 		return
 	}